Nature at 7 p.m. Sunday examines the extraordinary story of interspecies cooperation between killer whales and whalers in Australia as they joined in hunts for migrating baleen whales.

In his quest to solve his final case, Foyle must dig into one of the dirtiest secrets of the war and reveal truths the Allies would rather keep hidden on Masterpiece Mystery! Foyle’s War series V: All Clear at 8 p.m. Sunday.From the Top at 9:30 p.m. Sunday features 17-year-old pianist Ronald Joseph and 17-year-old violinist Allyson Tomsky along with 13-year-old singer Nikki Yanofsky.

Baseball great Roberto Clemente’s talent and inimitable style drew legions of fans, but as this American Experience at 8 p.m. Monday reveals, he was more than an exceptional baseball player.

American Masters at 9 p.m. Monday profiles comedian Carol Burnett.

Nova at 7 p.m. travels on the first descent into the dark depths of a newly prehistoric grave site of perfectly preserved remains of long extinct megafauna, including unknown kangaroo species and the first complete skeleton of the largest carnivorous marsupial ever found.

Frontline at 8 p.m. untangles the complicated financial and political web threatening one particular superbank — Bank of America.

Independent Lens “Ask Not” at 9 p.m. Tuesday explores the U.S. military’s “Don’t Ask, Don’t Tell” policy. The film exposes the tangled political battles that led to the discriminatory law and profiles charismatic activists determined to abolish it. As the war rages on, “Ask Not” reveals personal stories of gay Americans who serve in combat under a veil of secrecy.

The Territory at 10:30 p.m. Tuesday showcases new directions in film and video. These films offer a provocative mix of experimental, documentary, narrative, and animated shorts that allows the audience to take TV trips around the world and to major U.S. media festivals.

Great Performances at 7 p.m. Wednesday features Chess in Concert. Set during the Cold War intrigue of an international chess tournament, the musical dramatizes the romantic checkmate between an American chess champion, his lover, and a Russian opponent secretly planning to defect to the West.

Singer/songwriter/pianist Norah Jones returns to the Austin City Limits at 10 p.m. Wednesday and 9 p.m. Friday stage, showcasing both old favorites and songs from her recent best-selling album, Not Too Late. Special guest M. Ward.

The first African slave arrived in Texas in 1528, but it took until June 19, 1865 to end slavery in Texas and the United States. The anniversary of that day is celebrated as a holiday– Juneteenth. KLRU features 2008 and 2009 episodes of Juneteenth Jamboree at 8 p.m. and 8:30 p.m.

R&B veteran Bettye LaVette sings songs from her critically lauded album The Scene of the Crime, followed by legendary pianist Pinetop Perkins and his catalog of blues classics on Austin City Limits at 7 p.m. Saturday.